We need leap years because it takes Earth 365 days, 5 hours, 48 minutes and 46 seconds to orbit the sun, causing the calendar year to become more and more out of sync with the solar year over time. If we didn’t have leap days, February 2016 would actually be July 2017. Source
*If you begin counting from the time Julius Caesar met Egyptian astronomers and created a new calendar, it would be July 15, 2017.
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